/*
 * Indiana University Community Grid Computing Lab Software License,Version 1.1
 *
 * Copyright (c) 2002-2006 Community Grid Computing Lab, Indiana University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *      "This product includes software developed by the Indiana University
 *       Community Grid Computing Lab (http://www.communitygrids.iu.edu/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Indiana Univeristy","Indiana Univeristy Pervasive Techonology
 *    Labs" and  "Indiana Univeristy Community Grid Computing Lab" must not be
 *    used to endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    http://www.communitygrids.iu.edu/.
 *
 * 5. Products derived from this software may not use "Indiana
 *    University" name nor may "Indiana University" appear in their name,
 *    without prior written permission of the Indiana University.
 *
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * INDIANA UNIVERSITY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package cgl.narada.mgmt.common;

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.UnknownHostException;

import org.apache.log4j.Logger;

/**
 * Created on Jul 10, 2005
 *
 * @author Harshawardhan Gadgil (hgadgil@grids.ucs.indiana.edu)
 */

public class NetworkUtil {

   static Logger log = Logger.getLogger("NetworkUtil");

   public synchronized static boolean isPortFree(int portNo)
            throws PortRangeException {
      if (portNo < 1 || portNo > 65535)
         throw new PortRangeException(
                  "Port must be in range 1 - 65535: Requested [" + portNo + "]");
      try {
         ServerSocket ssock = new ServerSocket(portNo);
         ssock.close();
         return true;
      } catch (IOException e) {
         log.warn("Port: " + portNo + " is in USE !");
         return false;
      }
   }

   public synchronized static int getFirstFreePort() {
      int port = -1;
      try {
         ServerSocket ssock = new ServerSocket();
         port = ssock.getLocalPort();
         ssock.close();
      } catch (IOException e) {
         log.error("", e);
      }
      return port;
   }

   public synchronized static String getHostIPAddress() {
      String host = null;
      try {
         InetAddress[] addrs = InetAddress.getAllByName(InetAddress
                  .getLocalHost().getHostName());
         if (addrs.length == 1)
            host = addrs[0].getHostAddress();
         else {

            for (int i = 0; i < addrs.length; i++) {
               if (addrs[i].isSiteLocalAddress()) {
                  host = addrs[i].getHostAddress();
                  break;
               }
            }
         }
      } catch (UnknownHostException e) {
         host = "localhost";
      }

      return host;
   }

   public static void main(String[] args) {
      // try {
      // for (int i = 1; i < 1024; i++) {
      // System.out
      // .println("IS PORT <" + i + "> Free: " + isPortFree(i));
      // }
      // // System.out.println("Free port in 15 - 66: " + findFreePort(15,
      // // 66));
      // } catch (PortRangeException e) {
      // log.error("", e);
      // }

      System.out.println("My IP Address: " + getHostIPAddress());
   }
}